Why is it a bad idea to be working from home after 10pm?* Because opposing counsel might choose that time to send you an email. And that email might contain correspondence with more lame excuses regarding opposing counsel's insufficient discovery responses. And that correspondence might irritate you just enough to break the fine strand of your last nerve. And, your daily reserves of self-control long-spent, you might be tempted to fire off an email telling counsel precisely what you think of his inadequate discovery responses, rather than taking a more diplomatic and reasoned approach to the situation.

*As though there exists any good reason to be working from home after 10pm.